posted on Mar, 13 2009 @ 03:56 PM
Yup serial data is being sent from your keyboard and because of the EMF it causes it doesn't take much to receive it from a device near by and
convert that information back into the characters being typed. The problem is all the other RFI (radio frequency interference) being caused by other
You can take a small AM/FM radio and tune it to a clear channel near the end of the dial, set it next to your computer and hear the EMFs being caused
by the electronics. Just moving a mouse around or pressing a key will let you hear the sounds change from flow of data. It's possible because serial
data is timed at frequencies that can cause RFI to near by devices like radios.
To decode the RFI is another story. Since there are SO MANY random signals being caused by a computers components it is damn near impossible to single
out one of those signals, or to find what keys were pressed out of the tons of gibberish the other RFI is causing.
Besides all that if some technology exists that can really pull information out of thin air as to what you are typeing by nothing more then RFI caused
from a computer, there is one other major problem with this idea- distance. All components inside your computer are required to comply with the FCC
regulations, thus any signal generated by even your keyboard is very limited to how much interference it can cause and for how strong the EMF is.
Once again, take that AM radio that you can hear the noise on, slowly move it away from your computer. I bet you can't get a few feet away before it
goes back to only static. See my point?
There are better more efficiant ways to track what you are doing on a computer then this.
Edit: okay the artical says 22 yards via using the power lines as an arial. Impressive but still I can think of much easier ways to get the same job
done. Besides the powerline idea probably wouldn't work with laptops or newer keyboards and power supplies that have RF chokes on their
[edit on 3/13/2009 by darklife]